FEATHER LOSS mid back

Why are some of my hens losing feathers on their mid backs just in front of the tail.

They look healthy and are laying lots of eggs.
There are nine hens and one rooster cooped up for the winter in an 8x8 coop with an 8 foot roosting bar.

Ive watched for a while but have not seen the rooster mount any hens lately. But he used to do it frequently when they were outside in the run. But in winter they dont go out. When I am in the coop they are more interested in me than each other.

They will grow them in, and if they get more room they may stand a better chance. If it's a space issue that will solve it. It could also be that there aren't enough hens for that roo or that he's just more aggressive.

You might find yourself wanting a different morning crowing if he keeps it up . Roosters are pretty easy to come by in early summer

Did your issue end up being rooster related? We're experiencing the same problem. It started with one hen and now there's 4 hens with bare spots on their back. Our hens are 7 mos old and we don't have a rooster.

Did your issue end up being rooster related? We're experiencing the same problem. It started with one hen and now there's 4 hens with bare spots on their back. Our hens are 7 mos old and we don't have a rooster.

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Yes it was the rooster.
But hens will do it too.
My hens all regrew feather after their fall molt.
But one hen molted much later than the other five.
The others pecked at her pin feathers so much that she still has scrappy patches with no feathers.